Each element in the periodic table is assigned an atomic number which is the same as

the number of protons in the atom's nucleus.

Which is the correct symbol for the element sodium?

Na

Oxides are formed when oxygen combines with one other element. Which formula
A. CaCO3 B.CH3OH C. O2 D. Fe2O3

D

When some chemical elements and compounds form solids from the liquid state, the atoms or molecules form a definite or molecule forms a defiinite, regular, three-dimensional pattern. Such solids are described

crystalline

Which mineral characteristic could be used to distinguish between talc and calcite? A. hardness B. location C. fracture D. color

. hardness

A mineral can be identified by breaking it and then examining the directions it broke in. This test uses the mineral characteristic called

cleavage.

According to Mohs' scale of hardness, your fingernail has a hardness value of about 2.5. Which two minerals could you scratch with your fingernail?

gypsum and talc

What term should be used to describe a mineral crystal that had all of its edges of equal length, and all of its surfaces meeting at 90° angles? A.cubic B.monoclinic C. hexagonal D.triclinic